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Compilers & cache

Code Mount compiles and runs your code in this browser. Each compiler downloads once and is then cached. Download them here ahead of a test so nothing has to load during it.

~23.0 MB

Clang 22 (WebAssembly). LLVM Clang + LLD compiled to WebAssembly, targeting WASI. Programs run as native-speed wasm.

Java

~30.0 MB

Java 17 · ECJ on CheerpJ. Eclipse's Java compiler and a JVM running in your browser (CheerpJ). The first compile warms the compiler up, then compiles take well under a second.

Kotlin

~70.0 MB

Kotlin 2.4.21 · kotlinc on CheerpJ. The official Kotlin compiler on a JVM running in your browser (CheerpJ). The first compile is slow, then compiles take about two seconds.

Browser storage

Downloaded compilers live in your browser's cache. Persistent storage keeps the browser from clearing them when disk space runs low.

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